import React, { PureComponent } from 'react'
import PropTypes from 'prop-types'
import { Form, Input, Tree } from 'antd'
import menuList from '../../config/menuConfig'

const Item = Form.Item
const { TreeNode } = Tree

export default class AuthForm extends PureComponent {
  
  static propTypes = {
    role: PropTypes.object
  }

  constructor (props) {
    super(props)
    // 根据传入角色的menus生成初始状态
    const { menus } = this.props.role
    this.setState({
      checkedKeys: menus
    })
  }

  // 为父组件提交获取最新menus数据的方法
  getMenus = () => this.state.checkedKeys
  
  getTreeNodes = (menuList) => {
    return menuList.reduce((pre, item) => {
      pre.push(
        <TreeNode title={item.title} key={item.key}>
          { item.children ? this.getTreeNodes(item.children) : null}
        </TreeNode>
      )
      return pre
    }, [])
  }

  // 选中某个node时的回调
  onCheck = checkedKeys => {
    this.setState({ checkedKeys })
  }

  componentWillMount () {
    this.treeNodes = this.getTreeNodes(menuList)
  }

  // 根据新传入的role来更新checkedKeys状态
  // 当组件接收到新的属性时自动调用
  componentWillReceiveProps (nextProps) {
    const menus = nextProps.role.menus
    this.setState({
      checkedKeys: menus
    })
  }

  render () {
    const { role } = this.props
    const { checkedKeys } = this.state

    // 指定Item布局的配置对象
    const formItemLayout = {
      labelCol: { span: 4 }, // 左侧label的宽度
      wrapperCol: { span: 15} // 右侧包裹的宽度
    }

    return (
      <div>
        <Item label="角色名称" {...formItemLayout}>
          <Input value={role.name} disabled></Input>
        </Item>

        <Tree
          checkable
          defaultExpandAll={true}
          checkedKeys={checkedKeys}
          onCheck={this.onCheck}
        >
          <TreeNode title="平台权限" key="all">
            { this.treeNodes }
          </TreeNode>
        </Tree>
      </div>
    )
  }
}
